Study on dynamic characteristics of a rolling agricultural tire (Improvement of running condition)

Abstract

When agricultural machines are operated on pavements, the vibration and noise caused by the interaction between the tire lugs and the road surface are inevitable. In conventional studies, it is considered that the dynamic behavior of a rolling agricultural tire is influenced by the vibration characteristics of the tire. Resonance occurs when the lug excitation frequency of the tire becomes equal to the natural frequency of the tire. In other words, the rolling tire shows large vibrations in the direction of the natural mode corresponding to the natural frequency of the tire. However, in the conventional equipment, the diameter of the drum is smaller than that of the tire. Therefore, the real running condition on the road was not realized by the rolling test using the conventional equipment. In this study, a new equipment is produced and the dynamic and vibratory characteristics of operating agricultural machine are investigated. The obtained results are compared to the conventional ones and the influence of the running condition on dynamic characteristics of rolling tire is investigated. As a result, it is confirmed that the real running condition on the road can be realized in rolling test using the new equipment and the dynamic characteristics of the real running condition is obtained.

Keywords

• agricultural tire
• resonance
• spectrum analysis
• modal analysis
• natural frequency
• natural mode